<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>留言板</title>
    <style>
        .container {
            width: 350px;
            height: 300px;
            margin: 0 auto;
            /* border: 1px black solid; */
            text-align: center;
        }

        .grey {
            color: grey;
        }

        .container .row {
            width: 350px;
            height: 40px;

            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .container .row input {
            width: 260px;
            height: 30px;
        }

        #submit {
            width: 350px;
            height: 40px;
            background-color: orange;
            color: white;
            border: none;
            margin: 10px;
            border-radius: 5px;
            font-size: 20px;
        }
    </style>
</head>

<body>
<div class="container">
    <h1>留言板</h1>
    <p class="grey">输入后点击提交, 会将信息显示下方空白处</p>
    <div class="row">
        <span>谁:</span> <input type="text" name="" id="from">
    </div>
    <div class="row">
        <span>对谁:</span> <input type="text" name="" id="to">
    </div>
    <div class="row">
        <span>说什么:</span> <input type="text" name="" id="say">
    </div>
    <input type="button" value="提交" id="submit" onclick="submit()">
    <!-- <div>A 对 B 说: hello</div> -->
    <div class="content">

    </div>
</div>

<script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.6.4/jquery.min.js"></script>

<script>

    $.ajax({
        url: "/message/getList",
        type: "get",
        success: function (messageInfos) {
            var finalHtml = "";
            for (var message of messageInfos) {
                finalHtml += '<div>' + message.from + ' 对 ' + message.to + ' 说: ' + message.message + '</div>';
            }
            $(".content").append(finalHtml);
        }
    });

    function submit() {
        //1. 获取留言的内容
        var from = $('#from').val();
        var to = $('#to').val();
        var say = $('#say').val();
        if (from == '' || to == '' || say == '') {
            return;
        }

        //发送ajax请求
        $.ajax({
            url: "/message/publish",
            type: "post",
            data: {
                from: from,
                to: to,
                message: say
            },
            success: function (result) {
                if (result) {
                    //2. 构造节点
                    var divE = "<div>" + from + "对" + to + "说:" + say + "</div>";
                    //3. 把节点添加到页面上
                    $(".content").prepend(divE);
                    //4. 清空输入框的值
                    $('#from').val("");
                    $('#to').val("");
                    $('#say').val("");
                }else {
                    alert("输入不合法");
                }
            }
        });
    }

</script>
</body>

</html>